Bosun is an open-source, Go based, MIT licensed, monitoring and alerting system created by Stack Exchange and designed to work with Scollector, OpenTSDB, Logstash, Graphite, and Grafana. It has an expressive domain specific language for evaluating alerts and creating detailed notifications. It also lets you test your alerts against historical data for a faster development experience. The Scollector monitoring agent has a number of built in collectors for various systems and runs on Windows, Linux, Mac, and ARM based systems.

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